Chore/v2/ctrlf (#5217)

# Description of Changes

<!--
Please provide a summary of the changes, including:

- What was changed
- Why the change was made
- Any challenges encountered

Closes #(issue_number)
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---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.

frontend/src/core/components/viewer/EmbedPdfViewer.tsx

@@ -43,6 +43,8 @@ const EmbedPdfViewerContent = ({
     isThumbnailSidebarVisible,
     toggleThumbnailSidebar,
     isBookmarkSidebarVisible,
+    isSearchInterfaceVisible,
+    searchInterfaceActions,
     zoomActions,
     panActions: _panActions,
     rotationActions: _rotationActions,
@@ -184,7 +186,7 @@ const EmbedPdfViewerContent = ({
     onZoomOut: zoomActions.zoomOut,
   });
 
-  // Handle keyboard zoom shortcuts
+  // Handle keyboard shortcuts (zoom and search)
   useEffect(() => {
     const handleKeyDown = (event: KeyboardEvent) => {
       if (!isViewerHovered) return;
@@ -199,6 +201,16 @@ const EmbedPdfViewerContent = ({
           // Ctrl+- for zoom out
           event.preventDefault();
           zoomActions.zoomOut();
+        } else if (event.key === 'f' || event.key === 'F') {
+          // Ctrl+F for search
+          event.preventDefault();
+          if (isSearchInterfaceVisible) {
+            // If already open, trigger refocus event
+            window.dispatchEvent(new CustomEvent('refocus-search-input'));
+          } else {
+            // Open search interface
+            searchInterfaceActions.open();
+          }
         }
       }
     };
@@ -207,7 +219,7 @@ const EmbedPdfViewerContent = ({
     return () => {
       document.removeEventListener('keydown', handleKeyDown);
     };
-  }, [isViewerHovered]);
+  }, [isViewerHovered, isSearchInterfaceVisible, zoomActions, searchInterfaceActions]);
 
   // Register checker for unsaved changes (annotations only for now)
   useEffect(() => {